APA (7th ed.) Zitazioa

Hoornbeek. Water Pollution Policies and the American States. State University of New York Press.

Chicago Style (17th ed.) Zitazioa

Hoornbeek. Water Pollution Policies and the American States. State University of New York Press.

MLA (9th ed.) Zitazioa

Hoornbeek. Water Pollution Policies and the American States. State University of New York Press.